A kind of automatic defrosting control technology

named time-temperature difference method

was developed

which can indirectly identify the change of refrigerating capacity of refrigerator. Based on the compressor running time

degree of attenuation of the refrigerating capacity was estimated according to the change of the difference between the evaporation temperature and freezer temperature

while unsteady-state disturbances were removed. Experiments of typical ambient temperature and heat and moisture load were carried out

internal temperatures were measured when electric air door and box door was opening or closing. Then the automatic defrosting control rule was established under above results. The application of this new kind of defrosting control technology in the BCD-350W shows that the refrigerator can work properly in wide range of ambient temperature and different heat and moisture loads

the anti-interference ability and adaption ability to environment is strong

the percentage of defrosting energy consumption in total energy consumption is decreased by about 40% and energy saving effect is obvious.